191728573 has 2 divisors, whose sum is σ = 191728574. Its totient is φ = 191728572.

The previous prime is 191728553. The next prime is 191728627. The reversal of 191728573 is 375827191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151240804 + 40487769 = 12298^2 + 6363^2 .

It is an emirp because it is prime and its reverse (375827191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191728573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191728543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95864286 + 95864287.

It is an arithmetic number, because the mean of its divisors is an integer number (95864287).

Almost surely, 2^191728573 is an apocalyptic number.

It is an amenable number.

191728573 is a deficient number, since it is larger than the sum of its proper divisors (1).

191728573 is an equidigital number, since it uses as much as digits as its factorization.

191728573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 43.

The square root of 191728573 is about 13846.6087183830. The cubic root of 191728573 is about 576.6278488949.

The spelling of 191728573 in words is "one hundred ninety-one million, seven hundred twenty-eight thousand, five hundred seventy-three".